Chromecast Audio dongle has been discontinued. Found this to serve a Chromecast device with optical output. Just connect to a DAC then to an amp. You're good to go. : r/Chromecast
Chromecast Audio Connects Speakers and Stereo Systems for $35
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Will Google revive their almost perfect device Chromecast Audio
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Google announces Chromecast and Chromecast Audio for $35 - Neowin
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Google discontinues Chromecast Audio, but you can grab one for $15 now - The Verge
Google Chromecast Audio Review: Simple, Cheap, and Smart | Digital Trends
6 Ways to Troubleshoot Chromecast Audio Issues
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Archimago's Musings: MEASUREMENTS: Google Chromecast Audio - Part II: Digital Output
File:Chromecast Audio.jpg - Wikipedia
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Chromecast Audio review: The ultimate audio streaming dongle is better than ever - CNET